Reference: Confrey, T. & Daube, F. GS2D: A 2D Geometry Systems. March 1988, 1988.
Abstract: This document describes GS2D, a system for solving geometric constraints between rectangular objects in a two-dimensional world. The bounded interval representation used to model spatial constraints is presented and its implementation and efficient use discussed. We show the mapping of SIGHTPLAN's geometric constraint functions into the GS2D set of primitives.